Chin J Plant Ecol ›› 2019, Vol. 43 ›› Issue (3): 238-244.doi: 10.17521/cjpe.2018.0316

• Research Articles • Previous Articles     Next Articles

Study on compositions of parenchyma in twigs of woody saplings in Dabie Mountains, Anhui, China

ZHANG Xi-Jin1,SONG Kun1,2,3,*(),PU Fa-Guang4,GAO Zhi-Wen1,NI Tian-Pin1,CHU Xing-Hang1,WANG Ze-Ying1,SHANG Kan-Kan5,DA Liang-Jun1,2,3,*()   

  1. 1 Zhejiang Tiantong Forest Ecosystem National Observation and Research Station, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China
    2 Shanghai Key Lab for Urban Ecological Process and Eco-Restoration, Shanghai 200241, China
    3 Institute of Eco-Chongming, Shanghai 200062, China
    4 Anhui Dabie Mountain Forest Ecosystem National Observation Station, Jinzhai, Anhui 237354, China
    5 Shanghai Chenshan Botanical Garden (Shanghai Chenshan Plant Science Research Centre, Chinese Academy of Sciences), Shanghai 201602, China;
  • Received:2018-12-17 Revised:2019-02-27 Online:2019-04-23 Published:2019-03-20
  • Contact: SONG Kun,DA Liang-Jun E-mail:ksong@des.ecnu.edu.cn;ljda@des.ecnu.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(31500355);Supported by the National Natural Science Foundation of China(31670438);Supported by the National Natural Science Foundation of China(31600343)

Abstract:

Aims Axial parenchyma (AP) and ray parenchyma (RP) in secondary xylem have many important ecological functions, such as storage and translocation. Quantifying the compositions of parenchyma in secondary xylem will benefit the further research about their functions. However, the understanding of parenchyma compositions in current-year branches is still lacking.


Methods Eighteen woody saplings in the Tianma National Nature Reserve were selected for sampling. The proportions of cross-sectional area occupied by AP and RP were measured. The variations in parenchyma among species and their phylogenetic signals were analyzed. Compared with the related dataset, the differences between twigs and trunks were tested.


Important findings (1) The proportions of total parenchyma in twigs of the 18 woody saplings were 9.96%-18.56%, with the average of 14.80%; the proportions of RP (7.74%-15.45%) were higher than that of AP (1.13%-7.49%). (2) The total parenchyma (RAP) in twigs was lower than that in trunks, of which, RP in twigs was lower than that in trunks while AP showed an opposite pattern. The differences between twigs and trunks may be caused by the differences between different organs and different life history periods. (3) Significant phylogenetic signal was detected in the amount of AP in secondary xylem of twigs. This study primitively verified the phylogenetic signal of the secondary xylem parenchyma, and suggested that the difference between organs, and the difference between life history periods, had important effects on the variations of parenchyma.

Key words: parenchyma, phylogenetic signal, xylem, organ

Fig. 1

Dyed image of cross sections of twigs photographed by optical microscope. A, Carpinus cordata. B, Schoepfia jasminodora. Ray parenchyma cells arranged radially and were dyed blue to purple, while axial parenchyma cells arranged tangentially or paratracheally in the two pictures."

Table 1

Characteristics of woody samplings from the Dabie Mountains"

物种
Species
海拔 Altitude (m) 总计
Total number
马鬃岭 Mazongling 天堂寨 Tiantangzhai
592 837 920 960 1 130 740 922 1 000 1 017 1 200
白檀 Symplocos paniculata 1 1 1 3
豹皮樟 Litsea coreana var. sinensis 1 1 1 3
大果山胡椒 Lindera praecox 3 3 3 1 3 13
灯台树 Bothrocaryum controversum 1 2 1 4
芬芳安息香 Styrax odoratissimus 2 2 4
海金子 Pittosporum illicioides 1 3 1 1 6
黄丹木姜子 Litsea elongata 3 1 1 2 3 10
尖萼梣 Fraxinus odontocalyx 2 2 4
雷公鹅耳枥 Carpinus viminea 2 1 3
橉木 Padus buergeriana 3 3
千金榆 Carpinus cordata 3 3
青冈 Cyclobalanopsis glauca 3 3
青皮木 Schoepfia jasminodora 3 3
山胡椒 Lindera glauca 2 2 1 1 1 2 1 1 11
四照花 Cornus kousa subsp. chinensis 1 1 3 5
小叶白辛树 Pterostyrax corymbosus 1 1 1 1 3 7
细叶青冈 Cyclobalanopsis gracilis 2 2 3 1 3 3 14
紫茎 Stewartia sinensis 3 3

Table 2

Amount of parenchyma of species in the study region (mean ± SD)"

物种 Species 射线薄壁组织 RP (%) 轴向薄壁组织 AP (%) 总薄壁组织 RAP (%)
白檀 Symplocos paniculata 15.45 ± 3.37 3.11 ± 1.62 18.56 ± 4.96
豹皮樟 Litsea coreana var. sinensis 11.92 ± 2.63 4.18 ± 4.46 16.10 ± 7.09
大果山胡椒 Lindera praecox 12.65 ± 3.32 3.76 ± 1.36 16.41 ± 3.90
灯台树 Bothrocaryum controversum 9.59 ± 1.82 1.84 ± 0.53 11.43 ± 2.18
芬芳安息香 Styrax odoratissimus 12.71 ± 2.88 1.29 ± 0.83 14.00 ± 3.61
海金子 Pittosporum illicioides 9.32 ± 2.92 3.93 ± 0.65 13.25 ± 2.63
黄丹木姜子 Litsea elongata 13.88 ± 3.78 3.51 ± 1.59 17.39 ± 4.72
尖萼梣 Fraxinus odontocalyx 9.57 ± 2.28 3.07 ± 1.28 12.64 ± 2.63
雷公鹅耳枥 Carpinus viminea 10.62 ± 0.88 4.45 ± 2.57 15.07 ± 3.45
橉木 Padus buergeriana 8.72 ± 0.92 1.24 ± 0.58 9.96 ± 0.72
千金榆 Carpinus cordata 13.05 ± 1.68 4.45 ± 1.12 17.49 ± 1.68
青冈 Cyclobalanopsis glauca 8.91 ± 5.09 6.13 ± 0.81 15.03 ± 5.86
青皮木 Schoepfia jasminodora 7.74 ± 4.06 7.49 ± 1.19 15.22 ± 5.24
山胡椒 Lindera glauca 12.02 ± 1.76 4.02 ± 1.97 16.04 ± 2.33
四照花 Cornus kousa subsp. chinensis 12.55 ± 1.79 2.14 ± 0.71 14.69 ± 1.96
小叶白辛树 Pterostyrax corymbosus 9.97 ± 3.64 1.13 ± 0.64 11.10 ± 4.19
细叶青冈 Cyclobalanopsis gracilis 9.71 ± 2.38 6.36 ± 2.65 16.07 ± 3.62
紫茎 Stewartia sinensis 12.21 ± 1.17 3.77 ± 1.53 15.98 ± 2.00
最大值 Max 15.45 7.49 18.56
最小值 Min 7.74 1.13 9.96
平均值 Average 11.14 3.66 14.80
变异系数 Coefficient of variation 18.63 48.65 15.84

Fig. 2

Differences of the amount of parenchyma in sapling twigs and trunks of adult trees (mean ± SD, n = 8). The data of the amount of parenchyma in trunks were derived from Zheng & Martínez-Cabrera (2013). AP, axial parenchyma; RP, ray parenchyma; RAP, RP + AP. Different lowercase letters indicate significant differences (p < 0.05)."

Table 3

Phylogenetic signal of parenchyma in twigs of 18 woody saplings in the Dabie Mountains"

薄壁组织 Parenchyma K p
射线薄壁组织 RP 0.62 0.151
轴向薄壁组织 AP 1.03 0.004
总薄壁组织 RAP 0.65 0.152
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